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CVE-2025-23221

CVE-2025-23221 · Fedify has an Infinite loop and Blind SSRF found inside the Webfinger mechanism

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Fedify is a TypeScript library for building federated server apps powered by ActivityPub and other standards. This vulnerability allows a user to maneuver the Webfinger mechanism to perform a GET request to any internal resource on any Host, Port, URL combination regardless of present security mechanisms, and forcing the victim’s server into an infinite loop causing Denial of Service. Moreover, this issue can also be maneuvered into performing a Blind SSRF attack. This vulnerability is fixed in 1.0.14, 1.1.11, 1.2.11, and 1.3.4.

CVSS 5.4 · Medium · EPSS 0.6% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • fedify

    Versions
    • < 1.0.14: Affected
    • >= 1.1.0, < 1.1.11: Affected
    • >= 1.2.0, < 1.2.11: Affected
    • >= 1.3.0, < 1.3.4: Affected

    No fix published

  • @fedify/fedify npm

    Versions
    • 1.0.13
    Affected ranges
    • SEMVER: ≥ 1.0.13, < 1.0.14

    Update to 1.0.14

  • @fedify/fedify npm

    Versions
    • 1.1.10
    Affected ranges
    • SEMVER: ≥ 1.1.10, < 1.1.11

    Update to 1.1.11

  • @fedify/fedify npm

    Versions
    • 1.2.10
    Affected ranges
    • SEMVER: ≥ 1.2.10, < 1.2.11

    Update to 1.2.11

  • @fedify/fedify npm

    Versions
    • 1.3.3
    Affected ranges
    • SEMVER: ≥ 1.3.3, < 1.3.4

    Update to 1.3.4

Original sources

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